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One-dimensional iridium-based nanowires for efficient water electrooxidation and beyond
Nano Research ( IF 9.9 ) Pub Date : 2021-09-09 , DOI: 10.1007/s12274-021-3603-9
Leigang Li 1 , Xiaoqing Huang 1 , Pengtang Wang 2 , Zifang Cheng 2 , Qi Shao 2
Affiliation  

The sluggish reaction kinetics of oxygen evolution reaction (OER) has largely lowered the efficiency of electrochemical water splitting. Ir represents one of the state-of-the-art electrocatalysts for promoting OER especially in acidic electrolytes. However, it remains a formidable challenge to synthesize high-quality one-dimensional (1D) Ir-based nanostructures for improved electrocatalytic performance. Herein, a template-assisted synthesis method is reported wherein 1D porous Ir-Te nanowires (Ir-Te NWs) are synthesized with Te NWs serving as the template. The Ir-Te NWs exhibit highly enhanced OER performance compared to commercial IrO2 and Ir/C. In detail, the overpotentials to reach 10 mA·cm−2 are 248 and 284 mV in 1 M KOH and 0.5 M H2SO4, respectively, much lower than those of commercial catalysts. The Ir-Te NWs also show smaller Tafel slopes than commercial IrO2 and Ir/C, signifying faster reaction kinetics. Besides, much more durable OER activity can be maintained for Ir-Te NWs with negligible decay during 25 and 20 h stability tests in 1 M KOH and 0.5 M H2SO4, respectively. Further analysis indicates that the significantly improved OER performance of Ir-Te NWs could be ascribed to the larger electrochemical surface area and smaller electrical resistance. More significantly, the templated synthesis of Ir-Te NWs can be facilely extended to the fabrication of other metal-Te NWs including Ru-Te, Rh-Te and Pt-Te NWs. The design and synthesis of 1D metal-based NWs in this work provide important inspiration for the synthesis of diversified 1D metallic nanostructures with distinctly enhanced catalytic performance and beyond.



中文翻译:

用于高效水电氧化及其他方面的一维铱基纳米线

析氧反应(OER)缓慢的反应动力学在很大程度上降低了电化学水分解的效率。Ir 代表了最先进的电催化剂之一,用于促进 OER,尤其是在酸性电解质中。然而,合成高质量的一维 (1D) Ir 基纳米结构以提高电催化性能仍然是一项艰巨的挑战。在此,报道了一种模板辅助合成方法,其中以 Te NWs 作为模板合成一维多孔 Ir-Te 纳米线(Ir-Te NWs)。与商业 IrO 2和 Ir/C相比,Ir-Te NW 表现出高度增强的 OER 性能。具体而言,在 1 M KOH 和 0.5 MH 2 SO 4 中达到 10 mA·cm -2 的过电位分别为 248 和 284 mV分别远低于商业催化剂。Ir-Te NW 还显示出比商业 IrO 2和 Ir/C更小的塔菲尔斜率,表明反应动力学更快。此外,在 1 M KOH 和 0.5 MH 2 SO 4中的 25 和 20 小时稳定性测试期间,Ir-Te NW 可以保持更持久的 OER 活性,衰减可忽略不计, 分别。进一步的分析表明,Ir-Te NWs 显着改善的 OER 性能可归因于更大的电化学表面积和更小的电阻。更重要的是,Ir-Te NW 的模板化合成可以轻松扩展到其他金属-Te NW 的制造,包括 Ru-Te、Rh-Te 和 Pt-Te NW。这项工作中一维金属基纳米线的设计和合成为合成具有明显增强催化性能及更高性能的多样化一维金属纳米结构提供了重要的灵感。

更新日期:2021-09-10
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